code: def testStdDev_1(self):
      values = [1, 1, 2, 3, 5]
      seqDS = dataseries.SequenceDataSeries()
      stdDev = stats.StdDev(seqDS, 1)
      for value in values:
          seqDS.append(value)
      for i in stdDev:
          self.assertEqual(i, 0)
  
file_path: pyalgotrade/testcases/technical_stats_test.py
imports: import numpy
  from .None import common
  from pyalgotrade.technical import stats
  from pyalgotrade import dataseries
label_desc: Use image node_id 1 for calling the TestCase obj's underlying member method code with example usage: obj.testStdDev_1() without return types